| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 18h38m 51.0741s[1] |
| Declination | −85° 42′ 32.2260″[1] |
| Apparent magnitude (V) | 8.10±0.01[2] |
| Characteristics | |
| Spectral type | G0 V[3] |
| B−V color index | +0.59[2] |
| Astrometry | |
| Radial velocity (Rv) | 2.93±2.55[4] km/s |
| Proper motion (μ) | RA: +147.318 mas/yr[1] Dec.: −43.097 mas/yr[1] |
| Parallax (π) | 14.5962 ± 0.1186 mas[1] |
| Distance | 223 ± 2 ly (68.5 ± 0.6 pc) |
| Absolute magnitude (MV) | 4.09[5] |
| Details | |
| Mass | 1.13[6] M☉ |
| Radius | 1.39+0.07 −0.05[7] R☉ |
| Luminosity | 2.12[5] L☉ |
| Surface gravity (log g) | 4.25[6] cgs |
| Temperature | 6,054±80[6] K |
| Metallicity [Fe/H] | −0.03[6] dex |
| Rotational velocity (v sin i) | 5[8] km/s |
| Age | 7.0+2.5 −1.2[9] Gyr |
| Other designations | |
CD−85°150, CPD−85°478, HD 166066, HIP 91434, GSC 09527-01174[10] | |
| Database references | |
| SIMBAD | data |
HD 166066 is a solitary star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 8.10,[2] making it readily visible in binoculars, but not to the naked eye. The object is located 223 light years away from the Solar System,[1] but is drifting away with a poorly constrained radial velocity of about 2.93 km/s.[4]
HD 166066 has a stellar classification of G0 V, indicating that it is a G-type main sequence star similar to the Sun.[3] However, the calcium H & K lines are narrow and weak for its class.[3] It has 113% the mass of the Sun[6] and 139% its radius, along with twice its luminosity.[5][7]
The iron abundance is 93% that of the Sun, and is slightly hotter, with an effective temperature of 6,054 K[6] compared to the Sun's 5,778 K. HD 166066 is significantly older, with an age of 7 billion years,[9] and rotates modestly with a projected rotational velocityof5 km/s.[8]
